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dsr1 wrote:
Thanks for the input . I had no idea the Canon Extenders didn't work with all their lenses. I moved from Olympus and my EC-1.4 & EC-20 extenders both worked with any lens I put on my cameras including my Sigma 50-500 4.5-6.3. This is new to me and I don't understand why Canon would even make something for the market that might not work with their lenses. I know it can be done. I'm disapointed to hear this. I'm using a 60D camera with these lenses for more info.
DonR
Pentax makes (made) two styles of 1.4x and 2x teleconverters, short and long. The 'short' TC's are like third party ones from Kenko and Tamron, as their glass elements do not stick out past the body of the TC. The 'long' models were optimized for use with long lenmses, and their front elements extend about 5 cm past the front end of the TC body.
Canon Extenders are all of the 'long' type. They are optimized to work with relatively long lenses, and they're really good, especially the new Mk III's. The Canon tilt-shift lenses are an exception, as they also work with the Extenders.
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